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9 July 2003 Abnormal propagation and interface refraction of light in a photonic crystal and their applications
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Proceedings Volume 5000, Photonic Crystal Materials and Devices; (2003)
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States
We analyze the abnormal refraction and propagation when a light beam of finite and practical width enters a photonic crystal from a uniform medium. The beam propagation in the photonic crystal is very complex, and in many cases, is beyond the realm of refraction (even with a renormalized refractive index given by photonic band calculation). Generally, light propagation is restricted to a triangular region (or a fan), although the light may not fill the whole triangle, nor is the light intensity uniform in the triangle. It is found beam divergence does not have a definite connection with the fan shape of the region of light propagation, in contrast to dynamic X-ray theory. A new origin of the fan shape is suggested. Also simulations indicate that at microscale, a narrow light beam may zigzag in a photonic crystal with sufficiently high index contrast. An application of this phenomenon is to make a wide angle bend for waveguides. The designed bending structure has low loss and matches the mode size of a typical single-mode waveguide for fiber-optic communications. Our simulations are based on two-dimensional photonic crystals.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wei Jiang, Chuhua Tian, Linghui Wu, Yihong Chen, and Ray T. Chen "Abnormal propagation and interface refraction of light in a photonic crystal and their applications", Proc. SPIE 5000, Photonic Crystal Materials and Devices, (9 July 2003);


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